function [ ] = mx_eyelink_data_count( )
%MX_EYELINK_DATA_COUNT Counts total items in queue: samples, events, or both.
%
% Parameters:
% samples 	If non-zero count the samples.
% events 	If non-zero count the events.
% Returns:
% Total number of samples and events is in the queue.
%
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% Copyright Eduardo Aponte 2013
% aponteeduardo@gmail.com